Uplink congestion detection and control between nodes in a radio access network

• US 7,724,656 B2
• Filed: 01/14/2005
• Issued: 05/25/2010
• Est. Priority Date: 01/14/2005
• Status: Active Grant

• Current Assignee: Lenovo Innovation Company Limited Hong Kong (Lenovo Group Ltd.)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Sagfors, Mats, Lundh, Peter
• Primary Examiner(s): Ngo; Ricky
• Assistant Examiner(s): OVEISSI, MANSOUR
• Application Number:
  US11/035,021
• Publication Number:
  US 20060159016A1
• Time in Patent Office: 1,957 Days
• Field of Search: 370229-236, 370/352, 370/389, 370/395, 370/311, 370/329, 370/323, 370/333, 455/515, 455/513, 709/232
• US Class Current: 370/229
• CPC Class Codes: H04L 47/12 Avoiding congestion; Recovering from congestion
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/0205 at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 28/0247 based on conditions of the access network or the infrastructure network central resource management H04W28/16
• CPC Class Codes: H04W 28/0284 detecting congestion or overload during communication monitoring arrangements H04L43/00
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/10 Flow control between communication endpoints
• CPC Class Codes: H04W 36/22 for handling the traffic
• CPC Class Codes: H04W 72/29 between an access point and the access point controlling device
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 88/12 Access point controller devices

Abstract

Congestion in a radio access network (RAN) associated with transporting uplink information originating from one or more mobile terminals is detected. That detected RAN congestion is reduced using any suitable technique (several examples are described) and may be implemented in one or more nodes in the RAN. One advantageous (but non-limiting) application is to a RAN that supports high speed uplink packet access (HSUPA) and/or one or more enhanced uplink dedicated channels (E-DCHs).

Claims

1. A method for managing an overload or congestion condition between nodes in a radio access network (RAN), comprising:

monitoring for congestion in the RAN caused by transporting information between a base station and a radio network controller or two radio network controllers contained in the RAN;

detecting congestion over a base station-to-radio network controller interface or a radio network controller-to-radio network controller interface within the RAN, said congestion being caused by transporting the information between a base station and a radio network controller or two radio network controllers contained in the RAN; and

reducing the detected congestion over the base station-to-radio network controller interface or the radio network controller-to-radio network controller interface within the RAN caused by transporting the information between a base station and a radio network controller or two radio network controllers contained in the RAN, wherein mobile terminals that can request service from the RAN over a radio interface are not nodes contained within the RAN, and

wherein the RAN includes a first radio network controller coupled to a radio base station, and wherein the radio network controller detects uplink congestion over the base station and a radio network controller interface between the radio network controller and the radio base station,

wherein the reducing the detected congestion includes taking an action to reduce a parameter associated with a bit rate at which the information is transported over the base station and radio network controller interface, and

wherein the bit rate parameter is reduced based on an absolute bit rate parameter value or on a relative bit rate parameter value,

wherein the absolute bit rate parameter value corresponds to a maximum bit rate or transmission rower and the relative bit rate parameter value corresponds to a percentage or fraction of a current bit rate or transmission power.

2. The method in claim 1, wherein the RAN includes the first radio network controller coupled to a second radio network controller, and wherein one of the radio network controllers detects uplink congestion over an interface between the first and second radio network controllers.

3. The method in claim 1, wherein mobile terminal information is communicated to the RAN over the radio interface using uplink data flows, and wherein the bit rate parameter is reduced by reducing a bit rate of one or more uplink data flows.

4. The method in claim 1, wherein the bit rate parameter is reduced by sending control information in a control plane or in a user data plane.

5. The method in claim 1, wherein the bit rate parameter is reduced using scheduling grants or credits for uplink mobile terminal communications.

6. The method in claim 1, wherein the bit rate parameter is reduced by dropping one or more frames of one or more uplink mobile terminal communications.

7. The method in claim 1, wherein the bit rate parameter is reduced by releasing one or more diversity handover radio links.

8. A method according to claim 1

wherein the information is conveyed as a series of frames, and

wherein the congestion in the RAN is indicated by a frame delay or a frame loss occurring in the RAN.

9. The method in claim 8, wherein the detected frame loss is detected by analyzing frame sequence numbers or the detected frame delay is detected by analyzing frame time stamps for delay.

10. The method in claim 8, wherein the congestion in the RAN is detected based on a frame delay in the RAN exceeding a delay threshold or a frame loss occurring in the RAN exceeding a frame loss delay threshold.

11. The method in claim 1, wherein the congestion in the RAN is different from congestion in a cell service area associated with the base station.

12. The method in claim 1, wherein mobile terminals may transmit the information over a radio interface to the RAN using one or more enhanced uplink dedicated channels (E-DCHs).

13. A method for managing an overload or congestion condition between nodes in a radio access network (RAN), comprising:

monitoring for congestion in the RAN caused by transporting information between a base station and a radio network controller or two radio network controllers contained in the RAN;

detecting congestion over a base station-to-radio network controller interface or a radio network controller-to-radio network controller interface within the RAN, said congestion being caused by transporting the information between a base station and a radio network controller or two radio network controllers contained in the RAN; and

reducing the detected congestion over the base station-to-radio network controller interface or the radio network controller-to-radio network controller interface within the RAN caused by transporting the information between a base station and a radio network controller or two radio network controllers contained in the RAN,

wherein mobile terminals that can request service from the RAN over a radio interface are not nodes contained within the RAN,

wherein the RAN includes a first radio network controller coupled to a radio base station, and wherein the radio network controller detects uplink congestion over the base station and a radio network controller interface between the radio network controller and the radio base station,

wherein a first amount of bandwidth allocated to uplink dedicated channels and a second amount of bandwidth is allocated to enhanced uplink dedicated channels, and wherein the radio network controller sends a message to the radio base station to reduce the second amount of bandwidth when uplink congestion is detected in the RAN.

14. Apparatus for use in managing an overload or congestion condition between nodes contained in a radio access network (RAN), comprising:

a congestion detector for monitoring and detecting congestion on a link between two nodes contained in the RAN, where mobile terminals which receive service from the RAN are not nodes contained within the RAN, said congestion being caused by transporting the information on the link between the two nodes in the RAN, and

a congestion controller for reducing the detected congestion on the link between the two nodes contained in the RAN associated with transporting the information on the link between the two nodes contained in the RAN,

wherein the congestion controller is configured to reduce a parameter associated with a bit rate at which uplink mobile terminal information is transported through the RAN, and

wherein the congestion controller is configured to send an absolute bit rate parameter value or a relative bit rate parameter value for use by the radio base station to reduce a bit rate or power of one or more uplink mobile terminal transmissions,

wherein the absolute bit rate parameter value corresponds to a maximum bit rate or transmission power and the relative bit rate parameter value corresponds to a percentage or fraction of a current bit rate or transmission power.

15. The apparatus in claim 14, wherein the two nodes contained in the RAN include a first radio network controller coupled to a radio base station.

16. The apparatus in claim 14, wherein the two nodes in the RAN include a first radio network controller coupled to a second radio network controller, and wherein one of the radio network controllers is configured to detect congestion over an interface between the first and second radio network controllers.

17. The apparatus in claim 14, wherein the information is based on uplink data flows, and wherein the congestion controller is configured to send a signal to the radio base station to reduce a bit rate of one or more uplink data flows.

18. The apparatus in claim 14, wherein the congestion controller is configured to reduce the bit rate parameter by sending control information in a control plane or in a user data plane to the radio base station.

19. The apparatus in claim 14, wherein the congestion controller is configured to send a signal to the radio base station to restrict scheduling of one or more uplink transmission grants or credits.

20. The apparatus in claim 14, wherein the congestion controller is configured to release one or more diversity handover radio links to reduce the detected congestion.

21. The apparatus in claim 14, wherein a first amount of bandwidth allocated to uplink dedicated channels and a second amount of bandwidth is allocated to enhanced uplink dedicated channels, and wherein the radio network controller is configured to send a message to the radio base station to reduce the second amount of bandwidth when uplink congestion is detected in the RAN.

22. The apparatus in claim 15, wherein the information includes a series of frames, and

wherein the detected congestion in the RAN is indicated by a detected frame delay in the RAN exceeding a delay threshold or by a detected frame loss occurring in the RAN exceeding a frame loss delay threshold.

23. The apparatus in claim 22, wherein the detected frame loss is based on analyzed frame sequence numbers or the detected frame delay is based on analyzed frame time stamps.

24. The apparatus in claim 14, wherein the congestion in the RAN is different from congestion in a cell service area associated with the base station.

25. The apparatus in claim 14, wherein the RAN is configured to receive over a radio interface the information using one or more enhanced uplink dedicated radio channels (E-DCHs).

26. Apparatus for use in managing an overload or congestion condition in a radio access network (RAN) associated with transporting information in the RAN, comprising:

a scheduler for scheduling uplink transmissions from one or more mobile terminals, and

a congestion controller, coupled to the scheduler, for reducing congestion over a base station-to-base station interface, a base station-to-radio network controller interface, or a radio network controller-to-radio network controller interface within the RAN, said congestion being caused by transporting the information between two base stations, a base station and a radio network controller, or two radio network controllers contained within the RAN,

wherein mobile terminals which receive service from the RAN are not contained within the RAN, and

wherein the congestion controller is configured to receive one or more messages from a radio network controller in the RAN including information associated with reducing congestion in the RAN associated with transporting through the RAN the information received via an uplink radio interface from mobile terminals over one or more enhanced uplink dedicated channels (E-DCHs),

wherein the congestion controller is configured to reduce a bit rate or power associated with one or more uplink mobile terminal communications using negative acknowledgement messages.

27. The apparatus in claim 26, wherein the congestion controller is configured to instruct the scheduler to restrict uplink transmission grants or credits provided to the one or more mobile terminals.

28. The apparatus in claim 26, wherein the congestion controller is configured to drop one or more frames associated with one or more uplink mobile terminal communications.

29. The apparatus in claim 26, wherein the congestion in the RAN is different from congestion in a cell service area associated with the base station.